Car underframe



April 1946- K. F. NYs'rRoM 2,195,821

on uynnnmus Filed A ril 2. 1957 Patented Apr. 2, 1940 UNITED smrssPATENT orrlcs 1 Claim.

My invention relates to the car underframe and more especially to thebolster center filler construction of a railroad freight car andparticularly of what is known as an automobile car wherein the bottomcover plate at the intersection of the center sill and the bolster iseliminated and the bolster filler casting or element is combined withthe center plate to provide an integral casting whereby a materialsaving in weight is effected and a greatly simplified constructionprovided.

The invention has for its object the provision of a construction whereinthe bolster filler casting is united with the center plate so that theshocks will be transferred directly from the center sill construction tothe truck, or vice versa, without the possibility of shearing rivets as,however, was possible and did occur in underframe constructionsemploying bottom cover plates with attached center plates as heretoforeemployed.

The purpose of my invention is to eliminate breakage and the attendantdifficulties that have heretofore been encountered and to provide astronger construction.

The objects and advantages of my invention will be readily comprehendedfrom the detailed description of the accompanying drawing wherein:Figure 1 is a partial side elevation and longitudinal sectional view ofa part of a body bolster and center-filler; the right hand end of thebolster being broken away.

Figure 2 is a perspective view of the intermediate, ce'nter-fillerreceiving portion of the center sin and body bolster; the ends of thebolster and center sill being broken away.

In the particular exemplification, the center sill I is shown in thenature of an inverted channel member, with the bottom ll of the invertedchannel constituting the top of the center sill and preferably arrangedin the same horizontal plane as the top of the bolster plates I2. Thesides l3, l3 of the center sill channel terminate in outwardly disposedflanges l4, H which act as stiifeners.

The bolster is shown composed of the laterally spaced apart channels orflanged plates I5, l5, which constitute the sides of the bolster; andthese side members l5, I5 are provided with the top plates l2 and thebottom plates IS; the top and bottom plates being integrally united withthe side members or walls l5, l5 preferably by welding.

The flanges l1, H, at the upper and lower longitudinal edges of the sideplates l5, are preferably disposed outwardly and the top and bottomplates l2 and 16 are arranged to extend flush with the outer edges ofthe flanges ll, thus providing a compression member of substantialstrength without undue weight.

It will be understood, of course, that a similar construction andarrangement of bolster forming members are employed on each side of thecenter sill l0 and the respective bolster-forming members are eachintegrally united-preferably by welding-with the sides of the centersill. That is to say, the bolster side members abut against the sides l3of the center sill III with the lower flange 11 arranged on theoutwardly disposed flanges l4 of-thecenter sill as shown in Figure 2;

the abutting edges of the side members I5 being welded to the side wallsof the center sill; the top plate l2 welded to the center sill sidesflush with the top of the sill; while the bottom plate 16 of the bolsterabuts against the outwardly disposed flanges 14 of the center sill andis welded thereto; thus providing an underframe construction wherein thebody bolster is an integral part of the car center sill.' a The centersill l0 coincident with the bolster is provided with a center filler I8consisting of a webbed block or casting of width coextensive with. thewidth of the center sill so that the sides l9, IQ of the casting will beflush with the side walls l3, l3 of the-center sill, to which thecenter-filler is integrally united and a unitary structure provided.

The casting or center-filler l8 is-of vertical dimensions greater thanthe depth of the center sill l0 and the top of the casting is inintimate relation withithe top wall H of the center sill; while thelower end of the center-filler extends beneath the bottom plane of thecenter sill Hi and constitutes the center plate or male member of thecenter bearing. of the filler casting is shown slightly tapered and thisportion is of circular formation in order to rotatably fit into theusual dished or correlated female member of the center bearing locatedon the truck bolster, not shown. The center filler I8 is shown providedwith a pin receiving central bore 20.

With the combined center filler and center plate in intimate relationwith the center sill at top as well mat the sides, the combined centerfiller and center plate will be rigidly held in place and the shocksencountered by. the center sill will be transferred directly from thecenter sill through the combined center filler and center plate to thetruck, or vice versa.

The lower extended end- In structures as heretofore employed wherein abolster bottom cover plate was employed to extend transversely beneaththe center filler element, it has been diflicult to obtain a perfectbearing or flt between the bolster bottom cover plate and the flllercasting, with the result that the stresses encountered by the coverplate caused breakage due to the space between the filler-and the coverplate. a

In these structures as heretofore employed, the center plate was in turnsecured to the bottom cover plate and by reason of conditions justrecited the center plate was frequently broken and considerabledifliculty was encountered. With my structure this weakness has beeneliminated because no bottom cover plate is employed between flller andcenter bearing element; the

elements just mentioned being displaced by the solid mass thus alsoenabling the unit to be more readily secured to the center sill.

In the particular exempliflcation, the bolster is shown provided with areeni'orcing element 2| shown in the nature of an I-beam arrangedtransversely intermediate 01' the side walls II, I! of the bolster. Y

The specific exempliflcation disclosed in the drawing is believed to bethe best adaptation of the invention, but certain alterations may bemade without departing from the spirit of the invention. I

What I claim is;

In a car under-frame, a single piece metal center sill of invertedchannel form with outwardly disposed flanges at the lower sides thereof;and a built-up body bolster consisting of two sections arranged onopposite sides of the center sill, each section being composed of a pairof spaced apart metal channel members arranged with their sides disposedhorizontally outward, a top plate and a bottom plate extending across tothe outer edges oi" the sides of both channel members and throughout thelengths thereof and welded thereto, the channel members of each bolstersection resting on the bottom flanges of the center sill and eachbolster section welded to the sides and to the flanges of the centersill with the top plates of the bolster sections arranged flush with thetop of the center sill while the bottom plates 01' the bolster sectionsare arranged flush with the flanges of the center sill and the ends ofsaid top and bottom plates welded to the center sill.

KARL F. NYSTROM.

